Charging times

[modelx007]

Hi,
I know I saw somewhere sometime ago a chart that shows different charging times and of course I can't find it now.

Ie,
48 amps gives 28 miles
20 amps gives x miles
110 gives x miles

 

[CLLACAB]

I can tell you that my Nema 14-50 on a 50 amp circuit that charges at 40 amps (80%) gets me about 28/29 miles per hour. I also have a Level 2 charger that I use on my Volt. Before I put in the Nema, it charged at about 21/22 miles per hour. Not sure of the size of the circuit it is on.

 

[InternetDude]

It depends on the voltage.

 

[Mike K]

It depends on amperage but best case scenario for 110v/ 12a is generally 4 miles per hour and 240v/ 40a+ is 29. Both of these are on the mobile charger. If your car is equipped with dual chargers, you're using the high power wall connector and you have 80+ amp service you can get 60 miles per hour.

 

[Cottonwood]

A good rule of thumb is 3 rated mph per kW for AC charging. That includes AC to DC charging losses. To finesse it, then subtract 1 mph for inefficiencies.

So use V*A*3/1000-1

Some examples:

120V*12A*3/1000-1 = 3.3 mph or about 3 mph
240V*40A*3/1000-1 = 27.8 mph or about 28 mph
208V*40A*3/1000-1 = 23.0 mph or about 23 mph

For simplicity, kW*3 works well. Subtract 1 for finesse, mostly important at low powers like 120V charging.

Have Fun!

 

[AWDtsla]

It depends on amperage but best case scenario for 110v/ 12a is generally 4 miles per hour and 240v/ 40a+ is 29. Both of these are on the mobile charger. If your car is equipped with dual chargers, you're using the high power wall connector and you have 80+ amp service you can get 60 miles per hour.

You're not going to get 4mph out of 110V @ 12A.

- - - Updated - - -

A good rule of thumb is 3 rated mph per kW for AC charging. That includes AC to DC charging losses. To finesse it, then subtract 1 mph for inefficiencies.

So use V*A*3/1000-1

Some examples:

120V*12A*3/1000-1 = 3.3 mph or about 3 mph
240V*40A*3/1000-1 = 27.8 mph or about 28 mph
208V*40A*3/1000-1 = 23.0 mph or about 23 mph

For simplicity, kW*3 works well. Subtract 1 for finesse, mostly important at low powers like 120V charging.

Have Fun!

Too generic not accounting for the car. 70D has a different Wh/RM than a P90D, so will charge faster in terms of rated miles.

The equation is more like:
(V*A*efficiency-fixed_overhead)/(Wh/RM)

I haven't solved for all the numbers yet. But Wh/RM is known for your whatever car you're in.

 

[modelx007]

You're not going to get 4mph out of 110V @ 12A.

- - - Updated - - -



Too generic not accounting for the car. 70D has a different Wh/RM than a P90D, so will charge faster in terms of rated miles.

The equation is more like:
(V*A*efficiency-fixed_overhead)/(Wh/RM)

I haven't solved for all the numbers yet. But Wh/RM is known for your whatever car you're in.

Let's go with:
Model S 90D
Model X P90D

For formula.

 

[Mike K]

You're not going to get 4mph out of 110V @ 12A.

Well, I'm plugged into a standard outlet right now getting 4 miles per hour.

 

[AWDtsla]

Well, I'm plugged into a standard outlet right now getting 4 miles per hour.

It's rounding up. It's probably 3.6. Try VisibleTesla or Remote S with high precision turned on. I think a 70D with no voltage sag (~120V+) should be able to get closer to an actual 4.

 

[boonedocks]

My Tesla reports 231V / 79 Amps and 56 miles per hour in miles = 18Kwh

 

[Max*]

It depends on amperage but best case scenario for 110v/ 12a is generally 4 miles per hour and 240v/ 40a+ is 29. Both of these are on the mobile charger. If your car is equipped with dual chargers, you're using the high power wall connector and you have 80+ amp service you can get 60 miles per hour.

No, best case scenario is 31mph. Though I guess I had 245V at the moment...

You're not going to get 4mph out of 110V @ 12A.

Sure you are (well rounded to 4), I've charged on 120V for a few months before finally decided I might need a NEMA 14-50 (I have a short commute and charger at work). Though I was getting 124V I think.

- - - Updated - - -

It's rounding up. It's probably 3.6. Try VisibleTesla or Remote S with high precision turned on. I think a 70D with no voltage sag (~120V+) should be able to get closer to an actual 4.

Nevermind, we agree.

 

[supratachophobia]

It depends on the voltage.

Yes it does. So actually, 220v @40amp will do 28 mph / 230v @ 40amp will do 29mph / 240v @ 40 amp will do a solid 30mph

 

[FlatSix911]

Hi,
I know I saw somewhere sometime ago a chart that shows different charging times and of course I can't find it now.

Ie,
48 amps gives 28 miles
20 amps gives x miles
110 gives x miles

Here is the chart supplied with the HPWC to indicate the charging time and range based on your supplied current in Amps

 

[Cottonwood]

Here is the chart supplied with the HPWC to indicate the charging time and range based on your supplied current in Amps

View attachment 107782

Great chart! Thanks!

Remember, that chart is for 240 Volts. When the charging Voltage is 208 Volts (very common at commercial locations), scale by 208/240, 13/15, or 0.866..., all the same value. For example, at 80 Amps and 208 Volts, the charge rate is 58*0.866 or 50 mph.

 

[AWDtsla]

Great chart! Thanks!

Remember, that chart is for 240 Volts. When the charging Voltage is 208 Volts (very common at commercial locations), scale by 208/240, 13/15, or 0.866..., all the same value. For example, at 80 Amps and 208 Volts, the charge rate is 58*0.866 or 50 mph.

Highly idealized either way.

I don't know how many people are actually getting rated voltage, but it's rare when I get close to that. I see 7-8V drop @240, almost all which is on the utility side of the meter. When charging at 208 at work it drops to 199-200V. Actually I've been charging all day on a 120V/20A socket (because their are so many of them), which immediately drops down to 12A due to voltage drop, and is current running 100V/12A.

So consider yourself lucky if you get rated voltage, basically.

 

[Cottonwood]

Highly idealized either way.

I don't know how many people are actually getting rated voltage, but it's rare when I get close to that. I see 7-8V drop @240, almost all which is on the utility side of the meter. When charging at 208 at work it drops to 199-200V. Actually I've been charging all day on a 120V/20A socket (because their are so many of them), which immediately drops down to 12A due to voltage drop, and is current running 100V/12A.

So consider yourself lucky if you get rated voltage, basically.

That is exactly correct. I was just providing simple guidance.

At my homes, I have "stiff" electrical feeds, and often start at about 245 Volts that drifts down to 239 Volts or so; close enough for me. When my solar panels are at full power, I often see 241 or 242 Volts while charging at 80 Amps, but then again, they can produce about 90 Amps at 240 Volts in full sun.

At one hotel where I stayed with an 80 Amp HPWC, the Voltage started at 207 Volts, but sagged to 198 pretty quickly. 198/240 is 0.825 or 17.5% less charge rate than the ideal 240 Volts.

If you really want to have a close estimate, use the table above and scale by actual Volts over 240 Volts. If the current does a 25% rollback, reduce the rated mile charge rate by another 25%.

 

[Mike K]

No, best case scenario is 31mph. Though I guess I had 245V at the moment...

You bolded the part of my post that you disagreed with but missed the part where I said "generally" this is what you can expect. 29mph is generally what most see on 240/ 40amps and it's the figure Tesla uses.

 

[Fuma586]

I charge on "240v" 3phase and I only get 24 mph but that is because during certain hours I only get 200v instead of the full 240v.

I suspect this is do to high electrical usage in the industrial zone my office is located in.

 

[Max*]

You bolded the part of my post that you disagreed with but missed the part where I said "generally" this is what you can expect. 29mph is generally what most see on 240/ 40amps and it's the figure Tesla uses.

I generally don't like incorrect "best case scenarios".

 

[AWDtsla]

Again, specifying how many mph you get without specifying what car you're charging is futile. There's now 8 different rated miles.

I usually get 27 mph at 40/240, saw a 28 maybe once.